Center fork stop motion for looms



Jill 5, 1932.

v. LINDSJO CENTER FORK STOP MOTION FOR LOOMS Filed June 15, 1931 3 Sheets$heet l INVENTOR M BY July 5, 1932; v. LINDSJO 1,365,930

CENTER FORK STOP MOTION FOR LOOMS Filed June 15, 1951 5 Sheets-Sheet 2 mmmmmnnmm!11mmummnmmmunnmmmmnm INVENTOR W f w N) ATTORNEY July 5, 1932. v. L INDSJO l,865;930

CENTER FORK STOP MOTION FOR LOOMS Filed June 15, 1931 3 Sheets-Sheet 3 ATTORNEY on each pick of the-shuttle,

Patented July 5, 1932;

VEBNEIB,

LmnsJo, OFSHOPEDALEQ MASSACHUSETTS, lemma. Fro snRAPEIt .eomom.

TION,0F HorEDALE,mnsseonusnrms ncoarona'riou QELMAIHEJ oEN'rEn roitxsror ivior oii" m ooms f Application rum 1 1M115, sariim; 544,377."

' 'i This invention relates to looms andis more particularly directed toa filling stopginecha.

It is now the ordinary practice in the, socalled center: fork? stop mechanisin for looms to provide a detector mounted upon the lay between the, ends thereof andto' cause suohrfilling fork or detector to be raised peri- 10. odicallyto permittheshuttleto'pass andfthen to feel'for the filling and detect its presence or. absence in the shed; Shouldthefillingbe "ahsenton any pick, it isjdesirahle that the fill- 15vvv of mechanism to effect theloom stoppage.

, ,Oneiofthe objects "of the present invention is toprovide a center fork stop motion for looms wherein detection "of presence or ab-' senee of filling inthe shedmay beascertained and upon detection of, filling absenceset in operation a train ofmechanism for eflecting loom stoppage. i In the practical operation oflooms of the center, fork type, the filling laid in' the shed will frequently.- not support the tines of the center fork or detectorfollowingloomstoppage, with the result that theloom mayjagain he stopped unnecessarily.

i It is a further object ofthe invention, there-.

fore, to provide meansjwhich will serve to prevent loom stoppage on the: first beat up movement of the lay-when the loom is started after having-been stoppedl It isde'sirable that the time-intervals of the center fork movements be so coordinated that the shuttle may get out of the shedbe'fore V g the fork completes, its detecting function, and

another important feature of the present inwhereby ventionconsists in providing means I the time interval for raising the center fork is different or shorter-than the time interval ofjlowering the fork to determine the presence or absence of filling in the-shed. i s

Various other features of theinvention and I-T 1 s n re e t Yi j 'jefpert b 16 novel combinationspof parts will'best be made a loom? provided. with the; present invention, some of i the parts being broken away; '1

Fig. 2iis a fronti-viewof' the layshowing featuresof thepresent invention and, with pprtionsofrthelay broken awayg .7 E 3;.is:an=underperspectiveview ofthe 1 portions being 1 broken away;

Fig-.A' isa detail in frontielevati'ohshew ing the; cam means forraising the center 5 'forIi and-for effecting loom stoppage should the center fork fail to det t. Presence: of ing in the shed.v a

ing fork will initlate the operation ofa train Fig. 5;is-a detached detail partly iii-section;

Fig. his a sidegelevation-partly: in section 5 oneo'f' which is shown,-for rocking or beatgup 7 there is a-recessf) above-,which'the filling "thread a is laid on each pick: of the shuttle This, general relation of the-parts; iseshow-n 3 in Fig. 'l-wherein the sh'uttlefi isnshownas in the. left hand box.

Mounted on the lavasubstantially. central .thereofis abracket 7 .havingthefrontwardly projecting portion 8 between thesides of 8 whichisaerocking carrier 9 to which the. tines 10 of theicenterfork are secured.

n The axis of the rocking 'carrier 9 may extfend'to one side of the bracket, as at 11, and connected'fwiththe' extension 11 i's a light 9 spring (12, which serves to impart to' the V movements The lay-Q'is provided withthe usual reed 4 and-"aboutcelltralof the, lay

tinesof the center fork a downward movement forfascertaining whether filling has been laid'in' the shed ornot; 1

.I In accordance'with the present. invention buntermounted on the lay and so related-to bunterrwillbe positioned to" engage-the;

5i the center filling fork isassociated with a bunter'15: As shown, the bunter-15iscarried on one arm of a bell crank lever and extends frontwardlytherefrom, as more clearly indicated in Figi 1; Y One arm'16 of the bell crank lever carries th e'bunter and the heel'portion 17 projects rearwardlyfrom the armj16 of the bell crank lever and'r'ests upon the sur-' face of the bracket 13 to thereby take up the shock incident to engagementof the hunter :with the knock-'oif plunger, as will more fullvappear. The other arm 18 of'thehell "crank lever extends in the path of a pin 19 adjusta' hly secured to the actuating :rod. 20 whose lower end passes through a. guide 21 V secured to the layswor'd, as more clearly indiv cated in Fig; 1.' Pivotallv mounted. on a bracket 22 supported from the" loom frame -is a lever 23, its pivotal point 24 being located between the ends ofthe lever and the forward end of lever 23 has a pin and slot connlection 25 with the actuating rod."

The rearwardly extending arm 26 of the lever bears againsta cam 27 secured'to and operated by the under cam shaft 28 c It isrdesirable that the detection of presence or absenceof filling in the shed be'made on 7 each pick of the shuttle andconsequentlv the cam 27 is shown asa two lobe cam, it being understood that the under or cam shaft 28 makes one revolution to each tworevolutions of the crank shaft which operates the lay, as V usual. From the construction thus far de scribed it would be apparent that the hunter 15 will be inoved lengthwise of the lay in one direction and in order that it maybe returned or given, movement lengthwise of the lay in the opposite direction a spring '29 is caused to act upon the bell crank lever, asindicated in Figs. 1 and 2, that is to say, one end of the spring is connected to the arm 16 of the hel crankat 30. 'as shown, and the other end of the spring is connected to, a'fixed member preferablyextending from the bracket 13, as

, at 31, thus when the hunter 15 has been moved 3 in one direction by the actuating cam I and connections; as described, and thelower part ofthe cam is presented to the arm 26. of the lever 23, the spring will actnpon the bell crank to movethe hunter yieldingly in the opposite direction;

It maybe desirable in some instances to provide a stop for limiting the movement of .the hunter 15 longitudinally' of the layand to this endthe'hracket13 is provided with the stops 32. A rod 33 is connected-at 34 with the arm 16 of thebell crank and extends longitudinally of the lay where its pposite end is supportedin a hearing carried by the bracket 7. The hearing 35' formed hy'the hracket 7 therefore acts as a means of the set screws 40. c

Extending laterally from-thej axis of the center fork is a stop finger 41 which, of course,

* moves in consonance with the center forln When the hunter 15 is moved longitudinally of the lay by "itsac t'uating cam the stop finger 41 will ride along the inclined surfaces 37,

r 38 ofthe cam member '36, thereby lifting the tines of the center fork to permit the shuttle to pass, and as indicated in the drawings, suchoperatiOn is effected on movement of the cam 36 to theleft, Figs. 2 and'4. As the hunter 15 is moved to the right under the action of the spring 29, thetines of the center fork will dropunder the'infiuence of gravity plus the impulse of the spring 12 and if filling H has been laid in the shed the tine's'of the center fork will take position, as indicated in Fig. 1. If; however, no'filling islaid in the shed the tines of the fork will'not be arrested by the fillingandwill drop into the recess 5 of the-lay, therebycausingthe-stop finger 41 toride down the incline 38f'of' the cam member 36 and engage with the stop shoulder 39 and stop movement of the hunter 15 in position to cause loom stoppage, as will presentlyappear. c

It will thus be seen that the hunter 15.v is given apositive movement in one direction by thecam actuated means to pass the hun- .ter in front of the knock-0E plunger and into an inoperative position relative thereto, but as the hunteris moved in the opposite direction by its spring and filling is absent, the hunter will i be arrested operative relation to the knock-off plunger, sothat on frontward'movement of the lay the loom will be stopped. v

vThe breast beam 42 has a, Side portion 43 forzthe support of the knock-01f plunger and its associated parts, as shown in Fig. 1.

Theknock-oflplunger 44 has adownward- 1y extending arm 45 preferably provided with a notch 46 for engagement by the hunter when the filling is absent from the shed. The

knock-off plunger 44 extends frontwardly,

'and is connected at 47 with a knock-off le- 7 ver 48, which is pivotally mounted onthe' sup- Q The knock-off plunger 44 has a slide 51 mountedthereon, which slide is normally under the impulse of a spring '52, normally 63 positioned in the path of a t-rip'member the downwardly extending arm 45. I

acting to hold the slide in rear position with respect to the knock-oil plunger, a position which isdetermined by the end of the slide contacting with the shoulder portion of Xt'ending from the slide 51 is afcam projection' 54 which; whenithe knock-ofiplunger and slide are moved 'frontwardly tdefict loom stoppage, rides on to a bridge 55 formed as partjof the bracket '56,'the efiectbeing that on such forward movement ofithek'nockofiiplunge'r and slide thearm 45' ofthe plunger will be'rai'sed out of the "path of the bun- ;1 ter and simultaneouslyv therewith the loom will be stopped.

" Onthe first forwardbeat of the layL-"iollowing loom stoppage'the filling may not be laid in'the shed under sufficient tensionito support the tinesof the center fork andin, the absence of meansto prevent it, the loom would be again stopped. a I

In accordance withjthe present invention,

however, means areprovided for locking the 2 "knock-01f plunger in an inoperative position such inoperative position untilafter the first relative to the hunter 15 and maintain it in forward beat of the layfollowingloom stoppage and thereupon freeing the knock-off plunger for movement tooperative position, so that on the pick of the shuttle following loom stoppage the knock-off plunger.- is in position to be actu'atedbythe bunterprovided filling fails.

Pi'votally mounted on the support 43 at 57 is a locking member or lever 58, one endof P which is connected to the slot 51 'by the slide and pin connection 59,best shown in Fig. 3. i p 7 7 V The opposite end of the locking member or lever 58v extendsbeyond the pivotal support 57, as indicated at 60, and during normal weaving operations a latch 61 rests upon the top portion 60 ofthe lever 58.

The latch 61 is 'pivotally mounted 62 and has a downwardly extendingtrip finger 64 mounted on the lay by means of a bracket 65, as indicated in Fig. 11

The latch 61-is normally under. theinfluence of a spring 66, one end of which may be conveniently connected to the shipper knock-ofi' lever 48 and the other end of which is attachedto the latch at 67, and consequently exerts a downward pull upon the v latch. During normal weaving operations the trip finger 63 and the tripjmember 64 will not engage by reasonof the fact that.

the finger 63 is supportedin a frontward position by the engagement of the latch upon the end of the lockingmember or lever 60. When, however, the loom is stopp'ed'by absence of filling and the knock-oil plunger is moved frontwardly the end 6 00f the locking inember'or lever 58 will pass to the rear of the end of the'latch 61, whereupon the lever laid in the shed the parts occupy the position,

of the arm 45- of the knock-'ofi-plungen sm te r having been stopped'the' knock-oil plung gagementby 'the' .bunter should fillinggfail will be moved frontwardly, thereby knocking ofi the shipper and positioningthe-end 60 of thellocking member or'the lever 58 L rearward'ly of the latch 61 which'will thereupon hold the slide 51'- in locked position with the plunger knock-0H in an inoperative position. When the loom is firststarted ae er and'bunter are inoperatively related a r the lay completes its frontward movement for the beat-up following loom stoppage; the

trip member 64 will strike the downwardly extending trip finger 68"ofthe latch and free the slidet51 for movement rearwardly under the impulseof the spring "52,"thereby again positioning the knock-off plunger forenon "any succeeding beatcupof the lay.-

Owing to the fact th t the arm'x45 of the knock-off plunger extends downwardly the stress of the hunter .thereagainst-willhave a tendencyto lift the forwardend of the lunger, where it is connected to the. knocki oii lever 48 and so it may be desirable in some cases to interposea spring 68 betWeenthe end of the-knock-oif lever 48' and the front end of the plunger as indicated in-Figj3, but this maynot always be necessary.

- Itmay beidesirable insomecases-to provide a guard to preventundue'upward'movement ofthe stop finger 41 which is connected to the center fork and this-"is readily.pro-

vided by means of a-fixed guard member69,

which overlies the endportion of the stop finger 41.7 W i f "In order to insure that the trip finger 63 of thelatch 61 may'not' be struck by thetrip member 64 during; normal weaving 'opera- 1 tions, the top surface of the'lockingmember or lever 60 is inclined upwardlytowards the rear of} the loom, Fig. 5,'to provide aicanlming surface which acts to lift the-frontend V ofthe latch 61 as the end 60 of locking'mem 1 beror lever 58 movesfrontwardly' upon be ing released by the latch fthus moving the tripofinger 63 further frontwar'dly'sothatiit will" not be engaged by tripmember 64"; f As hereinbeforestated the-"presentinven- 1 'tion provides for effecting a-rapidupward =movement of the center fork followedby a slower downward movementuntil tlie'protecti'on point has 'been reached and the'na rapid drop provided .thereis absenoe of fill:

ing. This enables the center fork to be delayed somewhat in its downward movement, and then to approach the detecting point and engage the filling without injurious'effect thereon, andthen in case filling is absent. to suddenly drop to position the parts for loom stoppage. I

- 5 The lower orcam shaft 28 carries the cam 27 which is of the two lobe type 'to' effect detection of filling on each pick of the shuttle. As indicated more clearly in Figs; 6 and 7, the cam27 has portions between the points 5' and cfwhich act through the lever 23 to cause rapid upward movement of the center fork to p'ermitthe-shuttle to pass, and a portion; between'the points '0, at for permitting the center fork todrop slowly to the protectionpoint and a portion between the points d and e. topermit sudden drop of the center fork shouldfilling be absent from the shed. The forward end of the lever 237 is under theinfluence, of a sprlng 65, one end of which maybe secured to the lever '23, as indicated in Figs. 1 and 6, andtheother end of which maybe conveniently secured to the lay rock shaft 66,the function of such spring being so cause the rear end portion of the lever 23 to, bear against the periphery of the cam 27. The spring ispreferably stronger than the spring 29,;the function of the latter being I primarily-to causethe lever arm 18 to bear upon the pin 19 ofthe actuating rod 20.

The time interval relation in the movements of the center forkare peculiarly advantageous in some looms, particularlywhere the loom isprovided with aloose reed motion, asit enables the shuttle to pass out of the'shed before the detecting-function of the center fork hasbeen completed.

What is claimed'is:

V -'1. In a center fork'stop motionfor looms,- the combination of the lay,-a bunter mounted on the layforf movement relative thereto,a cam and connections between the cam and bunter for movingqthe bunter longitudinally ofthe layinone direction, a. spring for moving the bunter longitudinally of the lay in the opposite direction, a center fork mounted on the lay, a longitudinally movable link con nected to they bunter, for l move-ment' thereby and supporting a cam member bodily movablelongitudinally of the lay with thelink for. raising the center forkas the bunteris moved by its actuating cam in one direction, and interlocking means between the center fork and movable link for arrestlng movement of the bunter bv the spring when filling fails'to be laid inthe shed. e i

2. In a center fork stop motionfor looms, the combination of the lay, a bunter pivotally anounted on the lay for movement longitudinally thereof, an under or cam shaft having 7 7 'a cam, connections between the cam and bunter for-swingingth'e bunter longitudinally of the lay! in one direction, a spring forswinging the bunter'longitudinally of the lay in the opposite direction, a center fork mounted on the lay fordetecting the presence or absence of filling in theshed, a rod connected to the bunter for'movement thereby, a cam member supported by and'bodily movable with the rod for raising thecenter fork and then freeing" itto the'exercise of its detecting function, interengaging devices between the cam member and center fork for arresting the movementofthe rod under the stress of the ,mounted on the lay, abunter pivotally connected to thelay for swinging movementlongitudinally' thereof, an under or cam shaft having a cam for causing movement of the bunter about its pivotal.connection with the layin-one directionlongitudinally thereof, a

spring for moving the bunter longitudinally of the lay in the opposite direction, a rod con- I nected to the bunter for movement thereby, a cam device connected to the rod for raising the centerfork as the bunter is swung about its; pivot its actuating cam and a locking notchformed 1n the cam device, an arm actuated by the center fork for engagement with said locking notch whenthe center fork detects absence of filling in the shed, and a knock-off plunger actuated by the bunter to stop the loom when the bunter is arrested in its movement. Y 7 i V 4. In a center fork stop motion for looms, the combination of the lay, a center fork mounted on the lay, abunter pivotally connected to the lay, stops for limiting the swinging movement of the bunter, an under or cam shaft having a cam for causing movement of the bunter about its pivotal connection with the lay in one direction longitudinally of the lay, a spring for moving the bunter longitudinally of the lay, in the opposite direction, a rod sup'p'ortedon. the bunter for movement thereby, a cam device connected to the. rod for raising the center fork as the bunter is swung about its pivot 'by its actu- 1 on the 'lay' for movement lengthwise of the lay and having aheelbearing against-the lay to resist the shockIofknook-ofl', an under or cam shaft having a cam for 1 moving the bunter lengthwise of the'lay in one direction,

spring formoving the bunter longitudinally of thelay in the opposite direction, a center fork, means between the center fork and hunter for locking the hunter from movement by the spring when the center fork detects absence of filling in the shed, and means for engagement by the hunter to effect loom stoppage when the center fork detects absence of filling in the shed. r

6. In a center fork stop mot-ion for looms, the combination of the lay, a center fork, a hunter mounted on the lay and controlled in its position by the center fork, a plunger knock-off adapted to be actuated by the hunter when the center fork detects absence of filling in the shed, a lock for holding the plunger in an inoperative posit-ion after loom I stoppage, and a trip for the look actuated on the first beat-up movement ofthe lay after loom stoppage to permit the knock-off plunger to move to operative position. I

7. In a center fork stop motion for looms, the combination of the lay, a centerfork, a hunter mounted on the lay and controlled in its position by the center fork, a plunger knock-01f adapted 'to be actuated by the hunter when the center fork detects absence of filling in the shed, a spring controlled lock for holding the plunger in an inoperative position after loom stoppage, and a trip for the lock actuated on the first beat-up movement of the-lay after loom stoppage topermit the knock-off plunger to move to operative posi-' tion.

8. In a center fork stop motion for looms,

the combination of the lay, a hunter mounted on the lay, a cam for moving the hunter in one direction, a spring for moving the hunter in the opposite direction, a center fork acting to arrest movement of the hunter under the stress of the spring when the fork detects absence of filling,a knock-off plunger normally positioned for engagement by the hunter when its movement is arrested by the center fork, a lock for positively holding the knock-off plunger in an inoperative position following loom stoppage, and a trip for the lock actuated on the first beat-up movement of the lay after loom stoppage to free the knock-off plunger for movement to operative position.

9. In a center fork stop motion for looms, the combination of the lay, a hunter mounted on the lay for movement lengthwise thereof, an under or cam shaft having a cam, connections between the cam and hunter for moving the hunter lengthwise of the lay in one direction, a spring for moving the hunter lengthwise of; the lay in the opposite direction, a center fork for arresting movement of the hunter in response to the spring when the center fork detects failure of'filling, a knock-off plunger for engagement by the hunter on the heat-up, a lock for positively holding the knock-off plunger in an inoperative position relative to the hunter after the plunger has caused loomstoppage,-and a trip for freeing the plunger for movement to operative position on the first beat-up following the loom stoppage; v

10. In a center fork stop motion for looms, the combination of the lay, a knock-off plunger mounted in front of the lay, a hunter mounted on the lay, a cam for moving the hunter in one direction past the end of the knock-off plunger, a spring for moving the hunter 1n the opposite direction, a center fork, means controlled by the center fork for arresting movement of the hunter responsive to the spring for engagement with the knockoff plunger on detection of filling failure, a lock for holding the knock-off plunger in an inoperative position when it has been moved by the hunter to effect loom stoppage, and a trip for the lock which is actuated on the first beat up following loom stoppage.

11. In a center fork stop motion for looms,

plunger mounted in front of the lay, a hunter and 'centerffork mounted on the lay, means controlled by the center fork to position the hunter for engagement with the knock-off plunger on detection of filling failure to thereby stop the loom, a lock for holdingthe trip for the lock actuated on the first beat up following loom stoppage to permit the knock off plunger to become functionally effective.

12. I11 a center fork stop motion for looms, the combination of the lay, a'center fork, a r

the combination of the lay, a knock-off" knock-off plunger in an inoperative position i upon loom stoppage by the center fork, and a r hunter mounted on the lay, means controlled by the center fork to position the hunter to effect loom stoppage on failure of'filling, a V knock-01f plunger mounted in front of the lay,

a shipper knock-off adapted'to be actuated by the plunger, a'locking member for the knockofi'plunger for holdingthe plunger in an inoperative position when it has been moved to efl'ect loom stoppage, a latch for the locking member, and a part carried by the lay for tripping the latch on the first beat-up following loom stoppage.

13., In a center fork I the combination of thelay, a center fork, a hunter mounted on the lay, means controlled by the center fork to position the hunter to efi'ect loom stoppage on failure of filling, a

stop motion for looms,

knock-off plunger mounted in front ofthe 

